[koyote]

While I agree, I feel that third-party library consumption is a bit of an edge case (i.e. the majority of your interface implementations won't be wrappers around third-party stuff).

Whenever I do work closely with a third-party library, the wrapping pays for itself quite quickly because it never takes long for you to find a 'quirkiness' or unsuitability in how the library implements something and you end up with code resembling this:

   public void Do() {
     _instance.SpecialOptionForTheBehaviourYouRequire = true;

     try
     {
       _instance.Do();
     }
     catch
     {
       // Workaround for bug that has not been fixed in ThirdParty Library yet. Remove when fixed!
       _instance.ResetBrokenStateCausedByBug();
       _instance.Do();
     }
   }